苎麻吸镉特性及镉污染农田的改良

The Characteristic of Cadmium (Cd) uptake in ramie and improvement of Cd pollution in farm-field

本文对苎麻吸镉特性及镉污染农田改良进行了初步研究。田间试验结果表明，水田改良区苎麻地下根茎和地上茎叶镉累积率分别为２５８％和９１％；旱地改良区苎麻地下根茎和地上茎叶镉累积率分别为３１５％和１２７％。水田和旱地苎麻总吸镉率为１．６７％和２．２１％。大田调查结果苎麻地下根茎和地上茎叶镉累积率分别为２０８％和８３％，总吸镉率为１．４５％。试验表明苎麻实际对水田和旱地土壤镉的降低率分别为２．６５％和３．１７％。采用苎麻改良镉污染农田，可以切断镉随食物链对人体的危害，具有很好的经济效益和环境效益。

Field culture experiment show that Cd accumulate rate of ramie in amelioration aera of paddy field is:root and stem underground 258%, stem and leaf aboveground 91%,and in amelioration area of nonirrigated farmland is root and stem underground 315%, stem and leaf aboveground 127%. Each of the total Cd absorptivity of paddy field and nonirrigated farmland is 1.67% and 2. 21%. Large range field inrvestigation show that Cd accumulate rate of root and stem underground is 208%,of stem andleaf aboveground is 83%, and the total Cd absorptivity is 1. 45%.Experiment show that ramie should drop each content of Cd 2.65% and 3.17% forpaddy field and nonirrigated farmland. Use ramie to ameliorate Cd-polluted farmland,cutoff Cd endanger to human being through food Chain.